// task 处理异步任务
const fs = require('fs');
const {task} = require('folktale/concurrency/task');
const {split, find} = require('lodash/fp');

function readFile(fileName){
    return task(resolver => {
        fs.readFile(fileName, 'utf-8', (err, data) => {
            if(err){
                resolver.reject(err);
            }
            resolver.resolve(data);
        })
    })
}

readFile('package.json')
    // .map(split('\n'))
    // .map(find(x => x.includes('version')))
    .run()
    .listen({
        onRejected: err => {
            console.log(err);
        },
        onResolved: data => {
            console.log(data);
        }
    })